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System Restore
System Restore is a feature in Microsoft Windows that allows the user to revert their computer's state (including system files, installed applications, Windows Registry, and system settings) to that of a previous point in time, which can be used to recover from system malfunctions or other problems. First included in Windows ME, it has since been included in all following desktop versions of Windows released since, excluding the Windows Server.〔(No restore point for you ), Cnet, 2007-12-28〕 In Windows 10, System Restore is turned off by default and must be enabled by users in order to function.〔Jim Tanous, (and How to Enable System Restore in Windows 10" ), ''Tekrevue'', 2015-07-28〕
In prior Windows versions it was based on a file filter that watched changes for a certain set of file extensions, and then copied files before they were overwritten. An updated version of System Restore introduced by Windows Vista uses the Shadow Copy service as a backend (allowing block-level changes in files located in any directory on the volume to be monitored and backed up regardless of their location) and allows System Restore to be used from the Windows Recovery Environment in case the Windows installation no longer boots at all.
==Overview==
In System Restore, the user may create a new ''restore point'' manually (as opposed to the system creating one automatically), roll back to an existing restore point, or change the System Restore configuration. Moreover, the restore itself can be undone. Old restore points are discarded in order to keep the volume's usage within the specified amount. For many users, this can provide restore points covering the past several weeks. Users concerned with performance or space usage may also opt to disable System Restore entirely. Files stored on volumes not monitored by System Restore are never backed up or restored.
System Restore backs up system files of certain extensions (.exe, .dll, etc.) and saves them for later recovery and use.〔(MSDN System Restore Reference: Monitored File Extensions )〕 It also backs up the registry and most drivers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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